Mo Asumang, daughter of a black Ghanaian father and a white German mother, talks to BBC News about making her new documentary, The Aryans, in which she confronts racists, both in Germany and among the Ku Klux Klan in America.
"These people don't know their so-called enemy...when they talk to me they talk to reality," Mo says. Her approach is to smile at them and see how they respond.